I'm in a similar boat - not a student but about to buy a new laptop and seriously thinking about taking the mac plunge - I'm a PC user at home and work, but I acknowledge that the mac book pro is a fantastic laptop. Can someone please just justify the price point to me? Why pay double the price for a similarly specced PC notebook? (Slight exaggeration but there's no denying the price difference).
Jonathan, as to your original question, do not skimp on power, and rest assured you will need a lot of it. Not sure how deep into Adobe CS you are, but once you start video editing you will want all the power you can get your hands on. And rendering 3d models? You'll wish you sprung for that extra processing power when you're up at 5 am waiting for your images to render....
As for display size, if you're lugging the thing around back and forth a lot, for heaven's sake go for the small screen and with the money you save, buy a big momma of a screen for home. I HEARTILY recommend the DELL ultra-sharp 24inch-fantastic qualitly, excellent stand, and all the ports you could need, including card reader and usb's a plenty.
D-flux - tablet notebook eh? I'm intrigued.... how is it specced for heavy duty stuff mentioned above? Are you doing any of that?